1 files changed, 370 insertions, 0 deletions
diff --git a/sound/firewire/motu/motu-pcm.c b/sound/firewire/motu/motu-pcm.c
new file mode 100644
index 000000000..d410c2efb
--- /dev/null
+++ b/sound/firewire/motu/motu-pcm.c
@@ -0,0 +1,370 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * motu-pcm.c - a part of driver for MOTU FireWire series
+ *
+ * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
+ */
+
+#include <sound/pcm_params.h>
+#include "motu.h"
+
+static int motu_rate_constraint(struct snd_pcm_hw_params *params,
+				struct snd_pcm_hw_rule *rule)
+{
+	struct snd_motu_packet_format *formats = rule->private;
+
+	const struct snd_interval *c =
+		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+	struct snd_interval *r =
+		hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+	struct snd_interval rates = {
+		.min = UINT_MAX, .max = 0, .integer = 1
+	};
+	unsigned int i, pcm_channels, rate, mode;
+
+	for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
+		rate = snd_motu_clock_rates[i];
+		mode = i / 2;
+
+		pcm_channels = formats->pcm_chunks[mode];
+		if (!snd_interval_test(c, pcm_channels))
+			continue;
+
+		rates.min = min(rates.min, rate);
+		rates.max = max(rates.max, rate);
+	}
+
+	return snd_interval_refine(r, &rates);
+}
+
+static int motu_channels_constraint(struct snd_pcm_hw_params *params,
+				    struct snd_pcm_hw_rule *rule)
+{
+	struct snd_motu_packet_format *formats = rule->private;
+
+	const struct snd_interval *r =
+		hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
+	struct snd_interval *c =
+		hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+	struct snd_interval channels = {
+		.min = UINT_MAX, .max = 0, .integer = 1
+	};
+	unsigned int i, pcm_channels, rate, mode;
+
+	for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
+		rate = snd_motu_clock_rates[i];
+		mode = i / 2;
+
+		if (!snd_interval_test(r, rate))
+			continue;
+
+		pcm_channels = formats->pcm_chunks[mode];
+		channels.min = min(channels.min, pcm_channels);
+		channels.max = max(channels.max, pcm_channels);
+	}
+
+	return snd_interval_refine(c, &channels);
+}
+
+static void limit_channels_and_rates(struct snd_motu *motu,
+				     struct snd_pcm_runtime *runtime,
+				     struct snd_motu_packet_format *formats)
+{
+	struct snd_pcm_hardware *hw = &runtime->hw;
+	unsigned int i, pcm_channels, rate, mode;
+
+	hw->channels_min = UINT_MAX;
+	hw->channels_max = 0;
+
+	for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
+		rate = snd_motu_clock_rates[i];
+		mode = i / 2;
+
+		pcm_channels = formats->pcm_chunks[mode];
+		if (pcm_channels == 0)
+			continue;
+
+		hw->rates |= snd_pcm_rate_to_rate_bit(rate);
+		hw->channels_min = min(hw->channels_min, pcm_channels);
+		hw->channels_max = max(hw->channels_max, pcm_channels);
+	}
+
+	snd_pcm_limit_hw_rates(runtime);
+}
+
+static int init_hw_info(struct snd_motu *motu,
+			struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_pcm_hardware *hw = &runtime->hw;
+	struct amdtp_stream *stream;
+	struct snd_motu_packet_format *formats;
+	int err;
+
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+		hw->formats = SNDRV_PCM_FMTBIT_S32;
+		stream = &motu->tx_stream;
+		formats = &motu->tx_packet_formats;
+	} else {
+		hw->formats = SNDRV_PCM_FMTBIT_S32;
+		stream = &motu->rx_stream;
+		formats = &motu->rx_packet_formats;
+	}
+
+	limit_channels_and_rates(motu, runtime, formats);
+
+	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+				  motu_rate_constraint, formats,
+				  SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+	if (err < 0)
+		return err;
+	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+				  motu_channels_constraint, formats,
+				  SNDRV_PCM_HW_PARAM_RATE, -1);
+	if (err < 0)
+		return err;
+
+	return amdtp_motu_add_pcm_hw_constraints(stream, runtime);
+}
+
+static int pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_motu *motu = substream->private_data;
+	struct amdtp_domain *d = &motu->domain;
+	enum snd_motu_clock_source src;
+	int err;
+
+	err = snd_motu_stream_lock_try(motu);
+	if (err < 0)
+		return err;
+
+	mutex_lock(&motu->mutex);
+
+	err = snd_motu_stream_cache_packet_formats(motu);
+	if (err < 0)
+		goto err_locked;
+
+	err = init_hw_info(motu, substream);
+	if (err < 0)
+		goto err_locked;
+
+	err = snd_motu_protocol_get_clock_source(motu, &src);
+	if (err < 0)
+		goto err_locked;
+
+	// When source of clock is not internal or any stream is reserved for
+	// transmission of PCM frames, the available sampling rate is limited
+	// at current one.
+	if ((src != SND_MOTU_CLOCK_SOURCE_INTERNAL &&
+	     src != SND_MOTU_CLOCK_SOURCE_SPH) ||
+	    (motu->substreams_counter > 0 && d->events_per_period > 0)) {
+		unsigned int frames_per_period = d->events_per_period;
+		unsigned int frames_per_buffer = d->events_per_buffer;
+		unsigned int rate;
+
+		err = snd_motu_protocol_get_clock_rate(motu, &rate);
+		if (err < 0)
+			goto err_locked;
+
+		substream->runtime->hw.rate_min = rate;
+		substream->runtime->hw.rate_max = rate;
+
+		if (frames_per_period > 0) {
+			err = snd_pcm_hw_constraint_minmax(substream->runtime,
+					SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
+					frames_per_period, frames_per_period);
+			if (err < 0)
+				goto err_locked;
+
+			err = snd_pcm_hw_constraint_minmax(substream->runtime,
+					SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+					frames_per_buffer, frames_per_buffer);
+			if (err < 0)
+				goto err_locked;
+		}
+	}
+
+	snd_pcm_set_sync(substream);
+
+	mutex_unlock(&motu->mutex);
+
+	return 0;
+err_locked:
+	mutex_unlock(&motu->mutex);
+	snd_motu_stream_lock_release(motu);
+	return err;
+}
+
+static int pcm_close(struct snd_pcm_substream *substream)
+{
+	struct snd_motu *motu = substream->private_data;
+
+	snd_motu_stream_lock_release(motu);
+
+	return 0;
+}
+
+static int pcm_hw_params(struct snd_pcm_substream *substream,
+			 struct snd_pcm_hw_params *hw_params)
+{
+	struct snd_motu *motu = substream->private_data;
+	int err = 0;
+
+	if (substream->runtime->state == SNDRV_PCM_STATE_OPEN) {
+		unsigned int rate = params_rate(hw_params);
+		unsigned int frames_per_period = params_period_size(hw_params);
+		unsigned int frames_per_buffer = params_buffer_size(hw_params);
+
+		mutex_lock(&motu->mutex);
+		err = snd_motu_stream_reserve_duplex(motu, rate,
+					frames_per_period, frames_per_buffer);
+		if (err >= 0)
+			++motu->substreams_counter;
+		mutex_unlock(&motu->mutex);
+	}
+
+	return err;
+}
+
+static int pcm_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_motu *motu = substream->private_data;
+
+	mutex_lock(&motu->mutex);
+
+	if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)
+		--motu->substreams_counter;
+
+	snd_motu_stream_stop_duplex(motu);
+
+	mutex_unlock(&motu->mutex);
+
+	return 0;
+}
+
+static int capture_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_motu *motu = substream->private_data;
+	int err;
+
+	mutex_lock(&motu->mutex);
+	err = snd_motu_stream_start_duplex(motu);
+	mutex_unlock(&motu->mutex);
+	if (err >= 0)
+		amdtp_stream_pcm_prepare(&motu->tx_stream);
+
+	return 0;
+}
+static int playback_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_motu *motu = substream->private_data;
+	int err;
+
+	mutex_lock(&motu->mutex);
+	err = snd_motu_stream_start_duplex(motu);
+	mutex_unlock(&motu->mutex);
+	if (err >= 0)
+		amdtp_stream_pcm_prepare(&motu->rx_stream);
+
+	return err;
+}
+
+static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_motu *motu = substream->private_data;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		amdtp_stream_pcm_trigger(&motu->tx_stream, substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		amdtp_stream_pcm_trigger(&motu->tx_stream, NULL);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_motu *motu = substream->private_data;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		amdtp_stream_pcm_trigger(&motu->rx_stream, substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		amdtp_stream_pcm_trigger(&motu->rx_stream, NULL);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_motu *motu = substream->private_data;
+
+	return amdtp_domain_stream_pcm_pointer(&motu->domain, &motu->tx_stream);
+}
+static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_motu *motu = substream->private_data;
+
+	return amdtp_domain_stream_pcm_pointer(&motu->domain, &motu->rx_stream);
+}
+
+static int capture_ack(struct snd_pcm_substream *substream)
+{
+	struct snd_motu *motu = substream->private_data;
+
+	return amdtp_domain_stream_pcm_ack(&motu->domain, &motu->tx_stream);
+}
+
+static int playback_ack(struct snd_pcm_substream *substream)
+{
+	struct snd_motu *motu = substream->private_data;
+
+	return amdtp_domain_stream_pcm_ack(&motu->domain, &motu->rx_stream);
+}
+
+int snd_motu_create_pcm_devices(struct snd_motu *motu)
+{
+	static const struct snd_pcm_ops capture_ops = {
+		.open      = pcm_open,
+		.close     = pcm_close,
+		.hw_params = pcm_hw_params,
+		.hw_free   = pcm_hw_free,
+		.prepare   = capture_prepare,
+		.trigger   = capture_trigger,
+		.pointer   = capture_pointer,
+		.ack       = capture_ack,
+	};
+	static const struct snd_pcm_ops playback_ops = {
+		.open      = pcm_open,
+		.close     = pcm_close,
+		.hw_params = pcm_hw_params,
+		.hw_free   = pcm_hw_free,
+		.prepare   = playback_prepare,
+		.trigger   = playback_trigger,
+		.pointer   = playback_pointer,
+		.ack       = playback_ack,
+	};
+	struct snd_pcm *pcm;
+	int err;
+
+	err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm);
+	if (err < 0)
+		return err;
+	pcm->private_data = motu;
+	strcpy(pcm->name, motu->card->shortname);
+
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
+	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
+
+	return 0;
+}